TY  - BOOK
AU  - Doebner H D ed.
ED  - Bulgarian Summer School on Mathematical Problem of Quantum Field Theory (4th:1980:Primorsko, Bulgaria)
ED  - Bulgarian Summer School on Mathematical Problem of Quantum Field Theory
TI  - Twistor geometry and non-linear systems: proceedings
U1  - 530.15 
PY  - 1982///
CY  - Berlin
PB  - Springer-Verlag
ER  -